Checking resistances and wiring

• Separate 3 pin connector to knock sensor 1 -G61- -1-.
Fig 1: Separating 3 Pin Connector To Knock Sensor 1 G61
Courtesy of VOLKSWAGEN OF AMERICA, INC.
• Measure resistance between contacts 1+2, 1+3 and 2+3 at connections to knock sensors.

  Specification INFINITE Ω

• Connect test box VAG 1598/22 to control module wiring harness.
Fig 2: Connecting Test Box VAG 1598/22 To Control Module Wiring Harness
Courtesy of VOLKSWAGEN OF AMERICA, INC.
• Check wiring between test box and 3 pin connector for open circuit using wiring diagram.

Contact 1+socket 68

Contact 2+socket 67

Contact 3+socket 67

Wire resistance: Max. 1.5 Ω

• Additionally check wires at socket 67 for short to sockets 60 and 68.

  Specification: INFINITE Ω

If no wiring fault is detected:

• Loosen knock sensor and tighten again to 20 Nm.
• Carry out test drive.

During the road test the following operating conditions must be fulfilled:

• The coolant temperature must exceed 80° C.
• When the temperature is reached, the operating conditions

  Idling

  Part throttle

  Wide open throttle

  Overrun

  must be attained several times.

• At wide open throttle the speed must exceed 3500 RPM.

• Again check control module DTC memory.

If the malfunction is still present:

• Replace knock sensor -G61-.